Action Background

1) You need to pick two basic colors to be in your action background, and pick a size for your image. Since mine is going to be black/red, I chose a 400x100 image on a
black background. Your first step is to scribble with the pencil, using red. Don't scribble too much. Also, use variants of red, light lighter/darker shades. These should not be too prominent however, as they would take away from the main red. I usually go back over with black (or whatever the bg color is) afterwards. It should look like this:

2) Now that you have the base, you are going to do a motion blur on the background. Use Filter-Blur-Motion Blur I recommend using extremely high values for the distance. 999 will give you perfectly straight lines, but if you want it to a be a little less perfect,
try something lower. Another way to make it less perfect is to use a small gaussian blur. For my picture I wanted to use a picture of Spiderman, so I picked an angle that matched the direction he was going. The angle will be different for everyone, because everyone will choose a different picture. If this looks too empty, duplicate the layer, do Edit-Transform-Flip Vertical, then Edit-Transform-Flip Horizontal, and set the duplicated layer's blending mode to Linear Dodge.

3) Now paste a cut-out of the subject you want to use (in my case Spiderman). Add text, etc, and now you're done!